Please note that these clusters have no holes. We can also provide different sized lots e.AMETHYST PROPERTIES: Amethyst is a violet variety of quartz often used in jewelry. The name comes from the Ancient Greek? Methustos ("intoxicated"), a reference to the belief that the stone protected its owner from drunkenness; the ancient Greeks and Romans wore amethyst and made drinking vessels of it in the belief that it would prevent intoxication.
It is one of several forms of quartz. Amethyst is produced in abundance from the state of Minas Gerais in Brazil where it occurs in large geodes within volcanic rocks.Amethyst also occurs at many localities in the United States. Among these may be mentioned: the Mazatzal Mountain region in Gila and Maricopa Counties, Arizona; Red Feather Lakes, near Ft Collins, Colorado; Amethyst Mountain, Texas; Yellowstone National Park; Delaware County, Pennsylvania; Haywood County, North Carolina; Deer Hill and Stow, Maine and in the Lake Superior region of Minnesota, Wisconsin, Michigan, and Ontario in Canada. The largest amethyst mine in North America is located in Thunder Bay, Ontario.
Chemical formula - Silica (silicon dioxide, SiO2). Crystal habit - 6-sided prism ending in 6-sided pyramid (typical). Crystal system - rhombohedral class 32. Twinning - Dauphine law, Brazil law, and Japan law. Hardness - 7-lower in impure varieties.Diaphaneity - Transparent to translucent. Specific gravity - 2.65 constant; variable in impure varieties.
Optical properties - Uniaxial (+). = 1.543-1.553 ne = 1.552-1.554. Birefringence +0.009 (B-G interval). Melting point - 1650±75 °C.Solubility - insoluble in common solvents. This item is in the category "Collectibles\Rocks, Fossils & Minerals\Crystals & Mineral Specimens\Crystals". The seller is "rocksology" and is located in this country: US. This item can be shipped to United States.